Autunian

Autunian

[‚ō′tün·ē·ən]
(geology)
A European stage of Lower Permian geologic time, above the Stephanian of the Carboniferous and below the Saxonian.
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References in periodicals archive ?
The morphological changes starting during the Stephanian C and Autunian caused culmination of volcanic activity in this area.
The second, Autunian phase can be further subdivided into 3 cycles (Kozlowski, 1958; 1963), of which each comprises andesites in the lower part and rhyolites in the upper part.
a) AUTUNIAN (an inhabitant of Autun, a populated place in France), SABBATIST, SLEPELESSE
Cuticles of Cordaites from the Westphalian, Stephanian and Autunian of the Bohemian Massif(Czech Republic): a preliminary study.
In the Stephanian and the Autunian the rate of denudation increased, which is indicated by the unconformity surface at the contact with the Westphalian, poorly sorted deposits and distinctly lower accumulation potential of the area (relatively low thickness and numerous erosional surfaces in the deposits of the Svatonovice Mb.
Plant remains are of particular abundance in the lacustrine blackshales of the lowermost part of the Autunian Group and vanish progressively upwards because of the low potential of preservation in the red playa/floodplain pelites of the Saxonian Group.
gigas, Sphenophyllum thonii) are very diversified in the first but absent in the red sediments; similarly the callipterids with small pinnules (Arnhardtia mouretii, Gracilopteris strigosa, Rhachiphyllum schenkii), but also Odontopteris subcrenulata, Cordaites borassifolius and Poacordaites which were extending from the basal Autunian into the grey sediments of the Transition zone become absent in the red sediments.
In the Lower Autunian Group of the Lodeve basin western part, Debriette and Gand (1990) described Trachomatichnus Miller, 1880, a morphotype similar to those of the trackways coming from the Salagou Formation.
The same authors considered that the red sandy beds, in some places, are located directly on the Autunian sediments, while, in other places, these sediments are constituting the whole Permian section, representing the middle part of this system, and being named Saxonian.
Wagner and Martinez, 1982), of Early Permian (Autunian) age, equivalent to the Early Autunian macrofloral assemblages of the classic Autun Basin in central France.
The datation is comparable to well-studied palinomorph assemblages of Western Europe (Warrington, 1996) of Early Autunian age, to the "Zone A2" (Doubinger, 1974; Bouroz and Doubinger, 1977) of the Autun Basin in France, of several Switzerland Early Permian basins (Hochuli, 1985) and other Western Europe Early Permian basins, mainly in Germany and England (Clayton et al, 1977).